Add docs for managing secrets

ansible-playbook playbooks/scenarios/full-deployment.yml

```

## Handling Secrets

For sensitive information like passwords or tokens, avoid committing them to the repository. Instead, create a `secrets.yml` file in the `ansible/` directory (this file is git-ignored by default).

1. Create `ansible/secrets.yml`:

```yaml

lite2edge_registry_username: "your.username"

lite2edge_registry_password: "your-token-or-password"

```

2. Run the playbook passing the secrets file:

```bash

ansible-playbook playbooks/scenarios/full-deployment.yml -e @secrets.yml

```

## 01-deploy-kind-cluster.yml

**Purpose**: Create and configure Kind cluster

- Config: `../automation/1-kind-cluster/kind-config.yaml`

- Setup script: `../automation/1-kind-cluster/setup-env.sh`

## 02-install-dependencies.yml

## install-prometheus.yml

**Purpose**: Install cluster dependencies (Prometheus, NFD)

**Purpose**: Install Prometheus Stack

**Tags**:

- `prometheus`: Install Prometheus stack

## install-node-feature-discovery.yml

**Purpose**: Install Node Feature Discovery

**Tags**:

- `nfd`: Install Node Feature Discovery

## 02-deploy-harbor.yml